● Special Fidget Cube: Gears Linkage Design, made of pure brass, high quality, full of mechanical sense. | ● Easy to carry, simple, discrete and fun, also effective for focus and deep thought. | ● Helpful: Increases Focus and Attention for Children and Adults with ADHD, ADD OCD, and Autism. | ● Great Toy For Fidgeters. Perfect for waiting in lines, meditation, timing, quitting bad habits, striking up conversations, and more. | ● NOTE： This is a pure brass Fidget Cube, the surface may be oxidized and result in dark spots. It is a normal phenomenon, and makes the cube more classical as the time goes by.